题目

 We should try our best to complete the project, _____ the cost. A. no matter whatever    B. however      C. whatever             D. whichever 答案：C近年来我国多地出现雾霾天气，下列各项与形成雾霾无关的是A．工业粉尘 B． 汽车尾气 C．煤炭燃烧 D．风力发电